KR20160010321A - Light irradiation apparatus - Google Patents

Abstract

The purpose of the present invention is to provide a light irradiation apparatus which has a small temperature difference between LEDs and enables the emission of line-shaped light with approximately uniform irradiation intensity. The light irradiation apparatus, which irradiates an irradiation surface with line-shaped light extending in a first direction and having a predetermined line width in a second direction perpendicular to the first direction, comprises: a substrate; a plurality of light sources having a direction of a light shaft in a third direction perpendicular to the first direction and the second direction, and placed side by side with predetermined intervals along the first direction on the surface of the substrate; a plurality of radiating fins inserted and installed at the other surface of the substrate and connected in the first direction; and N cooling appliances (N is an integer of 2 or greater) placed side by side along the first direction to cover the radiation fins. Each of the cooling appliances accommodates a portion of the radiation fins, and includes a case forming a wind tunnel surrounding the portion of the radiation fins and a cooling fan which blows air from the outside and induces the same to the wind tunnel, and generates an air current of the first direction in the wind tunnel.

Description

[0001] The present invention relates to a light irradiation apparatus,

The present invention relates to a light irradiation apparatus in which a plurality of light sources are arranged in a line and emits light in a line shape, and more particularly to a light irradiation apparatus provided with a cooling mechanism for dissipating heat generated from a light source.

BACKGROUND ART Conventionally, a printing apparatus that performs printing using UV inks cured by irradiation of ultraviolet light is known. In such a printing apparatus, after ink is ejected from a nozzle of a head to a medium, ultraviolet light is irradiated onto dots formed on the medium. Since the dots are cured and fixed on the medium by the irradiation of ultraviolet light, good printing can be performed even on a medium which is difficult to absorb the liquid. Such a printing apparatus is described, for example, in Patent Document 1. [

Patent Document 1 discloses a printing apparatus comprising a conveying unit for conveying a print medium, six heads arranged in the conveying direction for ejecting cyan, magenta, yellow, black, orange and green color inks respectively, (6) for irradiating each of the heads with the dot ink ejected onto the print medium, and a main curing irradiation section for fixing the dot ink to the printing medium . The printing apparatus described in Patent Document 1 suppresses blurring between color inks and enlargement of dots by curing the dot ink in two steps of toughening and final curing.

The irradiating portion for temporary hardening described in Patent Document 1 is a so-called ultraviolet light irradiating device which is disposed above a print medium and irradiates ultraviolet light to the print medium, and irradiates line-shaped ultraviolet light in the width direction of the print medium. In the irradiating unit for light curing, LED (Light Emitting Diode) is used as a light source in order to make the printing apparatus itself lighter and more compact, and a plurality of LEDs are arranged side by side along the width direction of the printing medium.

In this way, when an LED is used as a light source, most of the supplied power becomes heat, and there arises a problem that the light emitting efficiency and life are lowered due to the heat generated by the LED itself. Further, such a problem becomes more serious in the case of an apparatus in which a plurality of LEDs are mounted, as in the case of the irradiating unit for toughening, in that the number of LEDs as heat sources increases. For this reason, in a light irradiating apparatus using an LED as a light source, generally, a structure for suppressing the heat generation of the LED by employing a cooling structure such as a heat sink is adopted (for example, Patent Document 2).

The light irradiation device (light source device) disclosed in Patent Document 2 has a plurality of LEDs, a heat radiator thermally coupled to each of the LEDs, and a fan for sending a cooling air flow along the arrangement direction of the heat radiator, (I.e., the LED) is efficiently cooled by the airflow that flows through the radiator.

[Patent Document 1] JP-A-2013-252720 [Patent Document 2] Japanese Unexamined Patent Publication No. 2011-154855

However, in the light irradiation apparatus of Patent Document 2, since the air for cooling the radiator is configured to flow only in one direction along the arrangement direction of the radiator (that is, along the arrangement direction of the LED), the temperature of the air passes through the radiator There arises a problem that a temperature difference occurs between the radiator (i.e., LED) disposed on the upstream side of the air flow and the radiator (i.e., LED) disposed on the downstream side. Generally, since the irradiation intensity of the LED has a temperature characteristic, when the temperature difference is generated between the LEDs arranged in a line shape, the irradiation intensity varies depending on the temperature difference.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a light irradiation apparatus capable of emitting light of a line shape with a substantially uniform illumination intensity with a small temperature difference between LEDs.

In order to achieve the above object, a light irradiation apparatus of the present invention is a light irradiation apparatus comprising: a light source that emits light of a line shape extending in a first direction and having a predetermined line width in a second direction orthogonal to the first direction, A light irradiating apparatus comprising: a substrate; a plurality of light sources arranged side by side at a predetermined interval along a first direction on the surface of the substrate, the light sources having a direction of an optical axis in a first direction and a third direction orthogonal to the second direction, (N is an integer of 2 or more) cooling mechanisms which are arranged side by side along the first direction so as to cover the plurality of heat-radiating fins, Wherein each of the cooling mechanisms includes a case for accommodating a part of the plurality of heat-radiating fins and forming a wind tunnel surrounding a part of the plurality of heat-radiating fins, and a blower for blowing air from the outside into the wind tunnel, The airflow in the first direction And a cooling fan for generating a cooling fan.

According to this configuration, since the plurality of heat-radiating fins are cooled substantially simultaneously by the N cooling mechanisms, it is possible to uniformly and efficiently cool the plurality of heat-radiating fins. Therefore, the plurality of light sources disposed on the substrate are uniformly cooled, the temperature difference between the respective light sources is extremely small, and the line-shaped ultraviolet light having substantially uniform irradiation intensity is emitted from the light irradiation device.

It is preferable that the case has an inlet port through which air from outside is taken in and an exhaust port through which air that has passed through the wind tunnel is exhausted, and the cooling fan is preferably provided in at least one of the intake port and the exhaust port.

It is preferable that the case has a space between the intake port and the wind tunnel to rectify the air from the outside. According to this configuration, it is possible to supply the air to the respective heat radiating fins substantially uniformly.

It is preferable that the case has a partition plate for partitioning space and wind tunnel.

In addition, it is preferable that the air inlet and the air outlet of each cooling mechanism are opened in the third direction.

It is also preferable that N is 2, and the exhaust port of each cooling mechanism is disposed closer to the substrate than the air inlet, and is opened in the first direction. In this case, the air inlet of each cooling mechanism may be opened in the first direction. Further, the air inlet of each cooling mechanism may be configured to be opened in the third direction.

Further, the light source may be composed of at least one or more LED (Light Emitting Diode) elements.

Further, it is preferable that light is a light including a wavelength that acts on the ultraviolet curable resin.

As described above, according to the present invention, it is possible to realize a light irradiation apparatus capable of emitting light in a line shape with a substantially uniform illumination intensity with a small temperature difference between LEDs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view for explaining a configuration of a light irradiation apparatus according to a first embodiment of the present invention; FIG.
2 is a schematic diagram for explaining an internal configuration of a light irradiation apparatus according to the first embodiment of the present invention.
3 is a perspective view (perspective view) showing a simulation result of the cooling air flow generated in the cooling device of the light irradiation apparatus according to the first embodiment of the present invention.
4 is an irradiation intensity distribution of ultraviolet light emitted from the light irradiation apparatus according to the first embodiment of the present invention.
5 is a cross-sectional view of a light irradiation apparatus according to a second embodiment of the present invention.
6 is a cross-sectional view of a light irradiation apparatus according to a third embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent portions are denoted by the same reference numerals, and description thereof is not repeated.

(First Embodiment)

1 (a) to 1 (d) are views for explaining the structure of a light irradiation apparatus 1 according to a first embodiment of the present invention, A top view, a left side view, a right side view, and a front view of the irradiation device 1. 2 is a schematic view for explaining the internal configuration of the light irradiation apparatus 1 according to the first embodiment of the present invention. Fig. 2 (a) is a schematic view showing the external appearance of the external case 100 of the light irradiation apparatus 1 FIG. 2B is a longitudinal sectional view taken along the line AA in FIG. 2A, and FIG. 2C is a transverse sectional view of FIG. 2A. The light irradiation apparatus 1 of the present embodiment is an apparatus mounted in a printing apparatus that performs printing using UV inks cured by irradiation of ultraviolet light and is arranged to face a printing medium not shown, And emits line-shaped ultraviolet light in the width direction (i.e., the direction orthogonal to the direction in which the print medium is conveyed). In the present specification, for convenience of explanation, the length (line length) direction of line-shaped ultraviolet light emitted from the light irradiation device 1 is referred to as a first direction (X-axis direction in the figure) (The Y-axis direction in the drawing) and the direction orthogonal to the X-axis and Y-axis (that is, the emitting direction of the ultraviolet light) in the third direction ), Which will be described below. 2 (a) and 2 (c), the outer case 100 is shown by a dotted line for the sake of convenience of explanation. In FIG. 2 (c) R2 are indicated by arrows.

1 and 2, the light irradiation device 1 of the present embodiment includes a light irradiation unit 200 that emits line-shaped ultraviolet light, a cooling device (not shown) that cools the light irradiation unit 200 And a box-shaped outer case 100 made of a metal (for example, aluminum) for accommodating the light irradiation unit 200 and the cooling device 300. The left side panel 103 and the right side panel 105 of the case 100 are provided with intake fans 301 and 303 for sending air into the inside of the case 100, The exhaust fans 305 and 307 for exhausting air are exposed.

1 (d), a rectangular light exit window 101a covered with a cover glass (not shown) is formed at the center of the front panel 101 of the case 100, and a light exit window 101a, a light irradiation unit 200 that emits line-shaped ultraviolet light along the X-axis direction is disposed.

As shown in Figs. 1 (d), 2 (a) and 2 (c), the light irradiation unit 200 of the present embodiment has a rectangular substrate 201 A plurality of LED (Light Emitting Diode) elements 203 (light sources) arranged on the substrate 201, and a heat sink 210.

The substrate 201 is a rectangular wiring substrate formed of a material having a high thermal conductivity (for example, aluminum nitride). The substrate 201 has 40 square wirings (in the X-axis direction and the Y- ) × 2 (Y-axis direction) LED elements 203 are mounted (FIG. 1 (d)). An anode pattern (not shown) and a cathode pattern (not shown) for supplying electric power to each LED element 203 are formed on the substrate 201. Each LED element 203 has an anode pattern And a cathode pattern, respectively, and are electrically connected to each other. The anode pattern and the cathode pattern are electrically connected to an LED driving circuit (not shown), and the driving current from the LED driving circuit is supplied to each LED element 203 via the anode pattern and the cathode pattern.

The LED element 203 is a semiconductor element which has an LED chip (not shown) having a substantially square light-emitting surface, receives a driving current from the LED driving circuit, and emits ultraviolet light having a wavelength of 365 nm. When a driving current is supplied to each LED element 203, ultraviolet light of a light amount corresponding to the driving current is emitted from each LED element 203, and a line shape Ultraviolet light is emitted. The driving current supplied to each LED element 203 is adjusted so that ultraviolet light of a substantially uniform amount of light is emitted from each LED element 203 of the present embodiment, Shaped ultraviolet light has a substantially uniform light amount distribution in the X-axis direction and the Y-axis direction.

The heat sink 210 is a member disposed in close contact with the back surface of the substrate 201 (the surface opposite to the surface on which the LED element 203 is mounted) and dissipates heat generated in each LED element 203, Or copper (Fig. 2 (c)). The heat sink 210 of the present embodiment includes a base plate 211 which is in close contact with the back surface of the substrate 201 and a plurality of heat dissipation fins 213 protruding from the base plate 211 in the Z- (Fig. 2 (b) and Fig. 2 (c)). There is a problem that when the drive current flows through each LED element 203 and the ultraviolet light is emitted from each LED element 203, the temperature rises due to self-heating of the LED element 203 and the luminous efficiency is remarkably lowered The heat sink 210 is provided so as to be in close contact with the back surface of the substrate 201 and the heat generated by the LED element 203 is transmitted to the heat sink 210 ) And forcibly dissipates heat. As the material of the heat sink 210, an alloy such as an aluminum alloy or a copper alloy may be used. In addition to the metal, a ceramic (for example, aluminum nitride or silicon nitride) or a resin A polyphenylene sulfide (PPS) to which a thermally conductive filler is added) may be used.

The base plate 211 is a rectangular plate-shaped member and its surface (the surface facing the back surface of the substrate 201) is bonded to the substrate 201 via, for example, a heat- As shown in FIG. Therefore, the heat generated from the LED element 203 is conducted to the base plate 211 quickly.

As shown in Figs. 2 (b) and 2 (c), on the upper surface of the base plate 211 according to the present embodiment, 23 heat radiation fins 213 extending along the X- Direction and are arranged at regular intervals in the Y-axis direction. Since the heat radiating fins 213 are formed integrally with the base plate 211, the heat conducted to the base plate 211 is quickly conducted to the heat radiating fins 213. As described later, as the cooling airflow generated by the cooling device 300 passes between the heat-radiating fins 213, the heat conducted to the heat-radiating fins 213 is efficiently radiated into the air have.

2 (c), the cooling device 300 is a device that surrounds the heat-radiating fins 213 and cools the heat-radiating fins 213 by flowing cooling air along the heat-radiating fins 213 . As shown in Figs. 2A to 2C, the cooling device 300 of the present embodiment includes a wind tunnel case 310 surrounding the heat dissipation fins 213, The air intake fan 301 and the air exhaust fan 305 are provided in the wind tunnel case 310. The air intake fan 301 and the air intake fan 301 are connected to the air intake fan 301 and the air intake fan 301, And a pair of arms 312 and 314 for supporting and securing the arms 305 and 307, respectively.

The pair of arms 312 and 314 are members of a rectangular bar metal (for example, aluminum) extending along the Z-axis direction, and the light irradiation unit 200 and the wind tunnel case 310 (Fig. 2 (a)). The intake fans 301 and 303 and the exhaust fans 305 and 307 are attached to the outside of the pair of arms 312 and 314 in the X axis direction.

The wind tunnel case 310 is a member of a metal (for example, aluminum) that covers the heat radiating fin 213. As shown in Figs. 2B and 2C, the first side panel 310a, A second side panel 310b, a partition plate 310c, rear panels 310d and 310e, a first partition plate 310f and a second partition plate 310g.

The first side panel 310a and the second side panel 310b are substantially rectangular plate-shaped members provided so as to sandwich the radiating fins 213 from both sides in the Y axis direction, and the pair of arms 312 and 314 And are fixed by screws or the like. The proximal end portions of the first side panel 310a and the second side panel 310b on the positive side in the Z-axis direction are connected to the upper surface of the base plate 211 (that is, the surface on which the heat- And the front end (the end on the Z-axis direction side) is connected to the rear panels 310d and 310e and fixed by screwing or the like.

The partition wall plate 310c is vertically disposed between the first side panel 310a and the second side panel 310b and is configured to divide the space in the wind tunnel case 310 into two spaces R1 and R2 Shaped member. As shown in Fig. 2 (c), the partition plate 310c according to the present embodiment extends between the heat radiating fins 213 in the fourth row from the right side and the heat radiating fins 213 in the fifth row and extends in the Z axis direction And one end thereof is in contact with the upper surface of the base plate 211 (that is, the surface on which the heat radiating fins 213 are disposed) and the other end is connected to the rear panels 310d and 310e.

The back panels 310d and 310e are plate-shaped members vertically disposed between the first side panel 310a and the second side panel 310b. The back panel 310d includes a first rectilinear section 310d1 bent in a <-shape when viewed in the Y-axis direction and extending in parallel to the X-axis direction, and a second rectilinear section 310d2 are formed. One end of the rear panel 310d is connected to the arm 312 and the other end of the rear panel 310d is connected to the rear end of the partition plate 310c, Panel 310e. Similarly to the back panel 310d, the back panel 310e has a first rectilinear section 310e1 bent in a <-shape when viewed in the Y-axis direction and extending in parallel in the X-axis direction, A second rectilinear section 310e2 inclined relative to the first rectilinear section 310e2 is formed. One end of the rear panel 310e (the proximal end of the first rectilinear section 310e1) is connected to the arm 314 and the other end (the distal end of the second rectilinear section 310e2) Panel 310d.

The first partition plate 310f is vertically disposed between the first side panel 310a and the second side panel 310b and is divided into two spaces R1U and R1L in the Z axis direction And is a plate-shaped member for partitioning the plate. As shown in Fig. 2 (c), the first partition plate 310f of this embodiment has one end portion connected to the arm 312, and the tip portion of the first and second heat dissipation fins 213 from the left Axis direction, and the heat dissipation fin 213 is accommodated in the space R1L.

The second partition plate 310g is vertically disposed between the first side panel 310a and the second side panel 310b and is divided into two spaces R2U and R2L in the Z axis direction And is a plate-shaped member for partitioning the plate. As shown in Fig. 2 (c), the second partition plate 310g of this embodiment has one end portion connected to the arm 314, and the tip portions of the first and second rows of heat dissipation fins 213 Axis direction, and the heat dissipation fins 213 are accommodated in the space R2L.

The arm 312 of this embodiment is provided with a substantially circular opening 312a (intake port) at a position corresponding to the space R1U and has a substantially circular opening 312b at a position corresponding to the space R1L. (Exhaust port) is formed. An intake fan 301 is attached to the outside of the opening 312a and an exhaust fan 305 is attached to the outside of the opening 312b. Therefore, when the intake fan 301 and the exhaust fan 305 are rotated, the outside air is taken in the space R1 along the X-axis direction, and the cooling air flow as indicated by the arrows in Fig. 2 (c) . Specifically, when the air from the outside is taken in by the intake fan 301 into the space R1U, the introduced air advances in the X-axis direction along the first partition plate 310f, and in the space R1U And is rectified. The air in the space R1U collides with the second linear portion 310d2 of the rear panel 310d and the partition plate 310c to be sent to the space R1L and the heat radiation fins 213, and is exhausted to the outside by the exhaust fan 305. Thus, in the present embodiment, the space R1U functions as a space for rectifying the air, and the space R1L functions as a wind tunnel for cooling the heat radiation fins 213. [

The arm 314 of the present embodiment is provided with a substantially circular opening 314a (inlet port) at a position corresponding to the space R2U similarly to the arm 312 and is provided at a position corresponding to the space R2L An approximately circular opening 314b (exhaust port) is formed. An intake fan 303 is attached to the outside of the opening 314a and an exhaust fan 307 is attached to the outside of the opening 314b. Therefore, when the intake fan 303 and the exhaust fan 307 rotate, air from the outside is taken in the space R2 along the X-axis direction, and the cooling air flow as indicated by the arrows in Fig. 2 (c) . Specifically, when the air from the outside is taken into the space R2U by the intake fan 303, the taken-in air advances in the X-axis direction along the second partition plate 310g, and in the space R2U And is rectified. The air in the space R2U collides against the second rectilinear section 310e2 of the rear panel 310e and the partition plate 310c to be sent to the space R2L and the heat radiation fins 213, and is exhausted to the outside by the exhaust fan 307. [ Thus, in the present embodiment, the space R2U functions as a space for rectifying the air, and the space R2L functions as a wind tunnel for cooling the heat radiation fins 213. [

As described above, the cooling apparatus 300 of the present embodiment divides the space in the wind tunnel case 310 into two spaces R1 and R2 along the X-axis direction, The heat dissipation fins 213 disposed in the spaces R1L and R2L are cooled at substantially the same time by generating the flow (that is, by the two cooling mechanisms). Therefore, the cooling capability of the cooling device 300 of the present embodiment is about twice as large as that of the conventional configuration in which one space is cooled by an airflow that flows only in one direction, and the heat dissipation fins 213 It is possible to uniformly and efficiently cool the cooling medium. Therefore, the plurality of LED elements 203 arranged on the substrate 201 are uniformly cooled, the temperature difference between the LED elements 203 is extremely small, and the light irradiation apparatus 1 has a substantially uniform irradiation intensity Line-shaped ultraviolet light is emitted.

3 is a perspective view showing the result of simulating the shape of the cooling airflow generated in the space R1 in the wind tunnel case 310 of the cooling device 300 of the present embodiment. 3, the intake fan 301, the exhaust fan 305, the light irradiation unit 200, and the case 100 are omitted for the sake of easy viewing of the drawings.

3, a part of the air taken into the space R1U is rectified in the space R1U, and the inside of the space R1U (that is, the partition plate 310c) It is possible to sufficiently cool the heat dissipation fins 213 disposed on the side closer to the partition plate 310c. A part of the air taken into the space R1U does not penetrate to the inside (that is, on the side of the partition plate 310c) along the X axis direction and passes through the space R1L near the first partition plate 310f, It can be seen that the heat radiating fins 213 disposed farther from the partition plate 310c can be sufficiently cooled.

4 is a view showing a state in which line-shaped ultraviolet light emitted from the light irradiation device 1 of the present embodiment is irradiated onto a print medium ), The irradiation intensity distribution in the X-axis direction. The abscissa of FIG. 4 shows the irradiation position (mm) when the center of the longitudinal direction (X-axis direction) of the line-shaped ultraviolet light is 0 mm, and the ordinate axis represents the irradiation intensity of ultraviolet light (mW / cm ² ). 4, according to the configuration of the present embodiment, the light irradiation device (1) from the know that it is the external light in line-like character of approximately uniform intensity (approximately 4000 (mW / cm ²⁾⁾ emitted .

The present invention is not limited to the above-described configuration, and various modifications are possible within the scope of the technical idea of the present invention.

For example, in the light irradiation unit 200 of the present embodiment, it is described that 40 (X axis direction) × 2 (Y axis direction) LED elements 203 are mounted on a substrate 201 However, the number of LED elements 203 arranged in the X-axis direction and the Y-axis direction can be appropriately increased or decreased in accordance with the required specifications. Further, each LED element 203 may have a structure in which a plurality of LED chips (dies) are provided therein.

The LED element 203 of the present embodiment has been described as emitting ultraviolet light having a wavelength of 365 nm. Alternatively, the LED element 203 may emit ultraviolet light having a different wavelength, or may emit visible light or infrared light, The use of the light irradiation device 1 is not limited to a printing device that performs printing using UV ink.

In the cooling device 300 of the present embodiment, the intake fan 301 and the exhaust fan 305 are provided in the space R1 and the intake fan 303 and the exhaust fan A predetermined cooling air flow may be generated in the spaces R1 and R2 and at least one of the intake fan and the exhaust fan may be provided in each of the spaces R1 and R2.

In the present embodiment, the outer case 100 and the wind tunnel case 310 are described as separate chains, but they may be integrally formed.

(Second Embodiment)

5 is a cross-sectional view of a light irradiation device 1A according to a second embodiment of the present invention. 5, the light irradiating apparatus 1A of the present embodiment is configured such that the intake fans 301A and 303A of the cooling apparatus 300A are provided with the openings 310da and 310d formed in the rear panel 310d, respectively, 310e of the first embodiment in that the direction in which the air is blown from the outside is in the Z axis direction.

Also in the present embodiment, the air from the outside is taken into the space R1U (or R2U) by the intake fan 301 (or 303), and is rectified in the space R1U (or R2U). The air in the space R1U (or R2U) is sent to the space R1L (or R2L), passes between the heat radiating fins 213 disposed in the space R1L (or R2L) 305 (or 307). Therefore, even with the configuration of the present embodiment, the heat dissipation fins 213 disposed in the spaces R1L and R2L are cooled substantially simultaneously, uniformly, and efficiently, The temperature difference between the LED elements 203 is small and the line-shaped ultraviolet light having substantially uniform irradiation intensity is emitted from the light irradiation device 1A.

(Third Embodiment)

6 is a cross-sectional view of the light irradiation device 1B according to the third embodiment of the present invention. 6, in the light irradiation device 1B of this embodiment, the space in the wind tunnel case 310B of the cooling device 300B is partitioned by three partition plates 310c into four R2, R3, and R4 are partitioned by the spaces R1, R2, R3, and R4, respectively, (that is, the structure includes four cooling mechanisms) And differs from the light irradiation device 1 according to the shape and the light irradiation device 1A according to the second embodiment. The three partition plates 310c of the present embodiment are arranged between the heat radiation fins 213 in the second row from the left side and the heat radiation fins 213 in the third row and between the heat radiation fins 213 in the fourth row and the heat radiation fins 213 in the fifth row The upper surface of the base plate 211 (that is, the heat-radiating fins 213) is disposed between the heat-radiating fins 213 so as to pass between the heat-radiating fins 213 of the sixth row and the heat- And is connected to the back panel 310dB, respectively.

6, the cooling apparatus 300B of the light irradiation apparatus 1B of the present embodiment is provided with a rear panel 310dB integrally formed so as to connect the pair of arms 312 and 314 have. The rear panel 310dB of this embodiment has a rectangular shape and a meandering shape that is bent at equal intervals and has a concave surface that protrudes toward the positive side in the Z axis direction from the outside in each of the spaces R1, R2, R3, (Through holes) X1 through which air is sucked, and intake fans 301B to 304B are attached to the intake ports X1, respectively. An exhaust port (through hole) X2 for exhausting air in the spaces R1, R2, R3, and R4 is formed on the convex surface protruding toward the Z axis direction side of the rear panel 310dB. (X2) are equipped with exhaust fans 305B to 308B. Air is taken in from the outside along the Z-axis direction and air in the spaces R1, R2, R3, R4 is exhausted along the Z-axis direction in the spaces R1, R2, R3, and R4. In the present embodiment, the position of each intake port X1 in the Z-axis direction is different from the position of each exhaust port X2 in the Z-axis direction, so that the high temperature air exhausted from each exhaust port X2, And is prevented from being sucked from each of the intake ports X1.

The cooling apparatus 300B of the light irradiating apparatus 1B of the present embodiment has partition plates 310fB, 310gB, and 310hB for partitioning the spaces R1, R2, R3, and R4 into two spaces in the X- And 310iB. Since the spaces R1, R2, R3 and R4 are partitioned by the partition plates 310fB, 310gB, 310hB and 310iB, the air taken in the spaces R1, R2, R3, Radiating fins 213 disposed on the lower side (the Z axis positive side) of the heat radiating fins 213 are securely cooled.

As described above, according to the configuration of the present embodiment, the heat dissipation fins 213 disposed in the spaces R1, R2, R3, and R4 can be cooled substantially uniformly and efficiently at the same time, A plurality of LED elements 203 disposed on the substrate 201 are uniformly cooled so that the temperature difference between the LED elements 203 is small and line-shaped ultraviolet light of substantially uniform irradiation intensity is emitted from the light irradiation device 1B It is released. In the present embodiment, since the spaces R1, R2, R3, and R4 are respectively cooled (that is, the structure includes four cooling mechanisms), the spaces R1 and R2 are cooled The cooling ability is high and the heat dissipation fins 213 can be cooled more uniformly as compared with the configuration of the first and second embodiments (that is, the configuration including two cooling mechanisms). In the cooling device 300B of the present embodiment, the space in the wind tunnel case 310B is divided into four spaces R1, R2, R3, and R4 to cool the space. However, the present invention is not limited to this configuration , And the number of divisions is appropriately set in accordance with a required specification (that is, uniformity of irradiation intensity of ultraviolet light).

It is also to be understood that the embodiments disclosed herein are by way of illustration and not of limitation in all respects. The scope of the present invention is not limited to the above description, but is intended to include all modifications within the meaning and scope equivalent to the claims of the present invention.

1, 1A, 1B: light irradiation device
100: external case
101: Front panel
101a: Light outgoing window
103: Left side panel
105: Right side panel
200: light irradiation unit
201: substrate
203: LED element
210: Heatsink
211: Base plate
213: heat dissipation pin
300, 300A, 300B: cooling device
301, 303, 301B, 302B, 303B, 304B:
305, 307, 305B, 306B, 307B, 308B:
310: Wind tunnel case
310a: first side panel
310b: second side panel
310c: bulkhead plate
310d, 310e, 310dB:
310f: first partition plate
310g: second partition plate
310fB, 310gB, 310hB, 310iB: partition plate
312, 314: Cancer
312a, 312b, 314a, 314b, 310da, 310ea:

Claims (19)

There is provided a light irradiation apparatus for irradiating a line-shaped light having a predetermined line width in a second direction extending in a first direction and perpendicular to the first direction,
A substrate;
A plurality of light sources having a direction of an optical axis in a third direction orthogonal to the first direction and the second direction and arranged side by side at a predetermined interval along the first direction on the surface of the substrate,
A plurality of heat dissipation fins installed on the back surface of the substrate and extending in the first direction,
N (N is an integer of 2 or more) cooling mechanisms arranged in parallel in the first direction so as to cover the plurality of heat dissipation fins,
And,
Each cooling mechanism includes:
A case accommodating a part of the plurality of heat-radiating fins and forming a wind tunnel surrounding a part of the plurality of heat-
A cooling fan for blowing air from the outside and guiding the wind to the wind tunnel to generate an air flow in the wind direction in the wind tunnel,
And a light source for emitting light. The method according to claim 1,
Wherein the case includes an intake port through which the air from outside is taken in and an exhaust port through which the air that has passed through the wind tunnel is exhausted,
Wherein the cooling fan is provided in at least one of the intake port and the exhaust port
Wherein the light irradiating device is a light irradiating device. 3. The method of claim 2,
Wherein the case has a space between the intake port and the wind tunnel for rectifying the air from the outside. The method of claim 3,
Wherein the case has a partition plate for partitioning the space and the wind tunnel. 5. The method according to any one of claims 1 to 4,
And the air inlet and the air outlet of each cooling mechanism are opened in the third direction. 5. The method according to any one of claims 1 to 4,
N is 2,
Wherein the air outlet of each of the cooling mechanisms is disposed closer to the substrate than the air inlet, and is opened in the first direction. The method according to claim 6,
And the air inlet of each cooling mechanism is opened in the first direction. The method according to claim 6,
And the air inlet of each cooling mechanism is opened in the third direction. 5. The method according to any one of claims 1 to 4,
Wherein the light source is composed of at least one LED (Light Emitting Diode) element. 5. The method according to any one of claims 1 to 4,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin. 6. The method of claim 5,
Wherein the light source is composed of at least one LED (Light Emitting Diode) element. The method according to claim 6,
Wherein the light source is composed of at least one LED (Light Emitting Diode) element. 8. The method of claim 7,
Wherein the light source is composed of at least one LED (Light Emitting Diode) element. 9. The method of claim 8,
Wherein the light source is composed of at least one LED (Light Emitting Diode) element. 6. The method of claim 5,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin. The method according to claim 6,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin. 8. The method of claim 7,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin. 9. The method of claim 8,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin. 10. The method of claim 9,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin.

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